KR20140135464A - a testing device for detecting fault signals of journal bearing - Google Patents

Abstract

The present invention relates to a test device for detecting the defect signal of journal bearings and, more specifically, to a test device for detecting the defect signal of journal bearings capable of providing load caused by unbalanced mass and misalignment to test defect-simulated test journal bearings, and detecting signal characteristics on all kinds of physical quantities presented as types of the defects of the journal bearings using sensor signals inputted by a sensor part so as to detect and collect the signal characteristics required for the monitoring and diagnosis of the state of the journal bearings used to support the load of rotor equipment in various industrial fields, such as nuclear power generation, thermal power generation, plants, and others. The test device for detecting the defect signal of journal bearings comprises: a rotary shaft rotated by the rotation force of a hydraulic motor; a system journal bearing and housing coupled to the middle of the rotary shaft, and having a journal bearing of a steady state and a housing for surrounding the journal bearing to be fixed; test journal bearing and housings arranged in both sides of the system journal bearing and housing, coupled to the rotary shaft, and having a defect-simulated test journal bearing and a housing for surrounding the test journal bearing to be fixed; disks arranged between the system journal bearing and housing and the test journal bearing and housings, coupled to the rotary shaft, and providing the load caused by the unbalanced mass to the test journal bearings in a rotation process; and a cylinder for applying load installed in the upper part of the system journal bearing and housing, and providing force of pushing downward to provide the load caused by the misalignment to the test journal bearings.

Description

[0001] The present invention relates to a test apparatus for detecting a journal bearing fault signal,

The present invention relates to a test apparatus for detecting a failure signal of a journal bearing, and more particularly, to a system for monitoring and diagnosing the condition of a journal bearing used for supporting a load of a rotating device in various industrial fields such as nuclear power, thermal power, In order to detect and collect the required signal characteristics for the defects, it is possible to provide mass unbalance and misalignment load to the defective test journal bearings, and by using sensor signals inputted from the sensor part, And more particularly, to a test apparatus for detecting a deficiency of a journal bearing defect capable of detecting a signal characteristic relating to each physical quantity.

Journal bearings are used to support loads on rotating machinery in a variety of industries, such as nuclear power, thermal power, and plants. Specifically, the turbine, pump, compressor, generator, etc., are important parts supporting the load of the entire rotating body when it is in operation.

The journal bearings supporting the whole load of the rotating body may cause various kinds of defects. If such defects, breakage or damage occur in the journal bearings, the performance of the whole system and the operation efficiency may be decreased, .

Therefore, in order to perform real-time monitoring and diagnosis, the journal bearings are monitored and diagnosed in real time during the operation of the system. In order to perform such real-time monitoring and diagnosis, vibration characteristics, temperature characteristics, And the motion trajectory characteristics of the rotary shaft are collected and signal characteristics related to various kinds of physical quantities need to be detected and extracted for each defect type of the journal bearing by using these signals.

Thus, in order to collect signals for realizing defect monitoring and diagnosis of journal bearings in advance, a device capable of testing the defects of journal bearings is required. By using such a test apparatus, various types of journal bearings There is a need to extract the signal characteristic relating to the physical quantity.

Conventionally, various test apparatuses for monitoring and diagnosing bearings have been developed. However, most of the conventional bearings defect testing apparatuses are devices for testing defects of ball bearings rather than journal bearings, and apparatuses for testing defects of journal bearings Has been hardly developed.

Although there is research and development on some journal bearings defect test apparatuses, these existing journal bearing joint test apparatuses are not devices that can test all the various types of defects that can occur in journal bearings, and they are only tested for defects of one journal bearing It was just a device that could. Therefore, it has a disadvantage that it can not extract signal characteristics related to various physical quantities corresponding to defects of various journal bearings.

In addition, conventional journal bearing defect testing apparatuses could not provide a defective environment. That is, a journal bearing test apparatus capable of providing a load due to a misalignment defect and a mass unbalance defect occurring in a rotating body to a journal bearing is not proposed. Therefore, it has a disadvantage in that it can not extract and characterize the signal characteristics that appear by defect types of journal bearings in various defect environments.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide a method of monitoring the condition of a journal bearing used for supporting a load of a rotating device in various industrial fields such as nuclear power, thermal power, In order to detect and collect the signal characteristics required for the diagnosis, it is possible to provide mass unbalance and misalignment load to the defect-tested test journal bearings, and to use the sensor signals inputted from the sensor part, And it is an object of the present invention to provide a test apparatus for detecting a deficiency of a journal bearing defect that can detect a signal characteristic of each kind of physical quantity appearing by type.

In order to solve the above problems, the present invention provides a test apparatus for detecting a fault signal of a journal bearing, comprising: a rotating shaft rotated by a rotational force of a hydraulic motor; And a housing for holding and fixing the test journal bearing, which is disposed on both sides of the system journal bearing and the housing, and which is coupled to the rotation shaft, A test journal bearing and a housing which are respectively disposed between the system journal bearing and the housing and the test journal bearing and the housing and which are coupled to the rotary shaft and which provide a load due to mass unbalance defects to the test journal bearing during a rotating operation, , The system journal bearing Doedoe installed on the upper portion of the housing, to provide a pushing force in the downward direction, including the load applied to the cylinder for providing a load due to misalignment fault in the test journal bearing is characterized in that is made.

Here, the defect simulated in the test journal bearing is any one of a wear defect, an electric defect, a corrosion defect, a fatigue defect and a peeling defect.

In addition, it is also possible to provide a lubricating device for supplying lubricating oil for lubricating the system journal bearing and the test journal bearing, a hydraulic pressure supply device for supplying hydraulic oil for rotation of the hydraulic motor, and an oil pressure unit for supplying hydraulic oil to the load- And a load control device for controlling the hydraulic oil supply pressure.

The sensor unit may further include a sensor unit for measuring a change in state of the rotation shaft, the system bearing journal, and the housing, the test journal bearing, and the housing according to the simulated defects of the test journal bearing, A three-axis acceleration sensor for measuring a vibration signal of the system journal bearing and the test journal bearing, a displacement sensor for measuring a distance signal to the surface of the rotary shaft, an inner surface metal temperature of the test journal bearing A three-axis force sensor for measuring a three-axis force signal applied to the system journal bearing and the housing, a torque sensor for measuring a rotational torque signal acting on the rotational shaft, And lubrication to measure the lubricating oil temperature signal at the inlet and outlet of the test journal bearing Inlet and outlet temperature sensor and is characterized in that the system of the journal bearing and the lubricating oil supply pressure sensor for measuring the feed pressure of the lubricating oil supplied to the test signal journal bearing, comprising at least one.

The signal collecting and controlling unit collects and analyzes signals inputted from the sensor unit and controls the driving unit. The signal collecting and controlling unit uses the signal input from the three-axis acceleration sensor Extracting a vibration signal characteristic represented by a defect type of the test journal bearing and extracting a rotary motion trace signal characteristic of a rotary shaft according to a defect type of the test journal bearing using a signal input from the displacement sensor, The method according to any one of claims 1 to 3, wherein the test journal bearing is a test journal bearing having a plurality of test bearings, Type of lubricant It characterized by extracting a temperature signal characteristic.

According to the test apparatus for detecting a fault signal of a journal bearing having the above-described problems and the solution means, a journal bearing used for supporting a load of a rotating device in various industrial fields such as nuclear power, thermal power, There is an advantage in that it is possible to provide a mass imbalance and a load due to misalignment in a test journal bearing which is defective, in order to detect and collect the signal characteristics required for the monitoring and diagnosis of the condition of the test journal.

Further, since the signal characteristic relating to various kinds of physical quantities appearing for each type of defect of the journal bearing can be detected by using the sensor signal inputted from the sensor unit according to the present invention, Real-time monitoring and diagnosis of journal bearings can be performed quickly and accurately, and reliable monitoring and diagnosis can be performed.

In addition, since the defect-simulated test journal bearings can be provided with loads due to mass unbalance and misalignment defects, various signal characteristics that can confirm the state change of the journal bearings due to the defect occurrence environment (misalignment or mass unbalance) There is an advantage to collect.

In addition, since it is possible to test a journal bearing that artificially simulates a variety of defects (abrasion, corrosion, corrosion, fatigue, peeling, etc.), it is possible to test a variety of journal bearings It has the advantage of collecting signal characteristics.

As a result, the signal characteristics detected by the defect types of the journal bearings can be utilized in the monitoring and diagnosis of the journal bearings performed in actual operation of the system in a reliable state.

1 is a configuration diagram of a test apparatus for detecting a fault of a journal bearing defect according to an embodiment of the present invention.
2 is a photograph showing an actual installation state of a test apparatus for detecting a fault of a journal bearing defect signal according to an embodiment of the present invention.
FIG. 3 is a configuration diagram for providing an erroneous defect environment in the provision of the defect environment applied to the embodiment of the present invention.
FIG. 4 is a block diagram of a test apparatus for detecting a fault of a journal bearing defect according to another embodiment of the present invention.
5 is an overall block diagram of a signal detecting apparatus for diagnosing a journal bearing defect according to another embodiment of the present invention.
FIG. 6 is a diagram illustrating a power supply relationship according to another embodiment of the present invention.
7 is a block diagram illustrating the operation of the lubrication apparatus according to another embodiment of the present invention.
FIG. 8 is an explanatory diagram of the operation of the hydraulic pressure supply apparatus applied to another embodiment of the present invention in a state in which the hydraulic motor is stopped.
FIG. 9 is an explanatory diagram of an operation of a hydraulic pressure supply apparatus according to another embodiment of the present invention in a state in which a hydraulic motor is started. FIG.
FIG. 10 is a view for explaining sensors and sensor mounting positions of a sensor unit according to another embodiment of the present invention.
FIG. 11 is a block diagram illustrating a detailed configuration module of a signal analysis processing unit according to another embodiment of the present invention, and a function performed by each module.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a test apparatus for detecting a fault of a journal bearing defect signal according to the present invention having the above-described problems, solutions and effects will be described in detail with reference to the accompanying drawings.

The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. In the following description, the same reference numerals are used for the same components as those of the fan described in the background art of the invention, and the new reference numerals are applied to them.

Since the test apparatus for detecting a defect of a journal bearing defect according to the present invention is developed as a model of a standard domestic nuclear power plant turbine, the detection signals according to the present invention can detect and observe a defect of a journal bearing constituting a standard domestic nuclear power plant turbine system .

In addition, the test apparatus for detecting a fault of a journal bearing fault according to the present invention provides a turbine speed increase and deceleration environment using a hydraulic motor, and various kinds of meters are used for testing the journal bearing fault signal according to the present invention And a signal acquisition apparatus (system) was constructed by installing the apparatus on the apparatus.

In addition, the test apparatus for detecting a defect in a journal bearing defect signal according to the present invention is constructed by separately manufacturing a cylinder type load providing device (load applying cylinder) to cause a defective environment.

FIG. 1 is a configuration diagram of a test apparatus for detecting a journal bearing fault signal according to an embodiment of the present invention, and FIG. 2 is a photograph of a test apparatus for detecting a journal bearing fault signal according to an embodiment of the present invention.

1 and 2, a test apparatus for detecting a failure signal of a journal bearing defect according to the present invention includes a rotating shaft 10 installed to be rotatable in a horizontal state, rotating bodies 10 coupled to the rotating shaft 10, , A system journal bearing and housing (5), a test journal bearing and housing (6) and a disk (9), and a load applying cylinder (14) arranged above the system journal bearing and housing .

The test apparatus for detecting a fault signal of a journal bearing according to the present invention corresponds to a test apparatus configured to collect signal characteristics for monitoring and diagnosis of a journal bearing supporting a load of a rotating machine during actual motion operation.

The test apparatus for detecting a fault of a journal bearing defect according to the present invention is a test apparatus for testing a journal bearing defect signal, which is capable of providing a defective environment for effectively collecting signal characteristics of an artificially defective test journal bearing, Device. That is, the test apparatus for detecting the journal bearing fault signal according to the present invention includes technical features capable of providing mass unbalance defects and misaligned defects that may occur during operation of the rotating body.

The rotary shaft 10 constituting the test apparatus for detecting a fault of a journal bearing defect signal according to the present invention is constituted by a rotary shaft 10 constituting each of the rotary elements (the disk 9, the system journal bearing and the housing 5) And the test journal bearing and housing 6).

The rotary shaft (10) is installed to rotate by the rotational force of the hydraulic motor (1). Therefore, one end of the rotary shaft 10 is connected to be rotatable by the rotational force of the hydraulic motor 10, and the other end is disposed in a state of being supported by the axial movement fixed support 11.

The shaft support stationary support 11 supports the other end of the rotary shaft 10 to prevent the rotary shaft 10 from moving due to a force provided from the hydraulic motor 1, And is rotatably fixed.

One end of the rotary shaft 10 may be directly connected to the shaft of the hydraulic motor 1 but may be connected to the shaft of the hydraulic motor 1 by means of couplings 2 and 4 in order to receive a stable, do. That is, the axis of the hydraulic motor 1 and the rotary shaft 10 are connected by the couplings 2 and 4.

More specifically, as shown in FIG. 1, a first coupling 2 and a second coupling 4 are provided to transmit the rotational force of the hydraulic motor 1 to the rotary shaft 10 . A torque sensor 3 is disposed between the first coupling 2 and the second coupling 4. The torque sensor 3 arranged in this manner is provided for measuring the rotational torque acting on the rotating shaft 10. [

The rotating journals 10 arranged as above are combined with rotors, that is, the system journal bearings and the housing 5, the test journal bearings and the housing 6, and the disk 9 and the like.

The system journal bearing and the housing 5 are constituent elements including a steady-state journal bearing installed at the center of the rotary shaft 10 and a housing for holding and fixing the journal bearing. As will be described later, And applies a load to the test journal bearing constituting the test journal bearing and the housing (6).

As described above, the system journal bearing and the housing 5 are coupled to a central portion of the rotary shaft 10, and consist of a journal bearing in a steady state and a housing for holding and fixing the journal bearing. Preferably, the system journal bearing and the housing 5 are detachably attachable to the rotary shaft 10.

The system journal bearing and housing 5 include a steady state journal bearing for receiving a force from the load applying cylinder 14 to provide a load caused by misalignment defects in the test journal bearing and housing 6 While the test journal bearing and housing 6 are components that include test journal bearings in which various possible defects are artificially simulated.

That is, when the test journal bearing and the housing 6 are operated with a system including a journal bearing having various defects, in order to collect what kind of defect signal characteristics appear on the rotating body including the journal bearing and on the rotating shaft, And a housing for holding and fixing the test journal bearing.

Such a test journal bearing and housing 6 are coupled to the rotating shaft 10 adjacent to the system journal bearing and housing 5. Specifically, the test journal bearings and the housing 6 are disposed on both sides of the system journal bearing and the housing 5, respectively, and are coupled to the rotational shaft 10, As shown in Fig.

Preferably, the test journal bearing and the housing 6 are detachable so that the test journal bearing and the housing 6 can be detachably coupled to the rotating shaft 10. The reason why the test journal bearing and the housing 6 are detachably mounted and detachably attached to the rotary shaft 10 is that the test journal bearing in which various defects are artificially simulated is coupled to the rotary shaft 10 Thereby collecting signal characteristics for various types of defects.

Defects imitated in the test journal bearings are defects that may occur during actual system operation, and are defects that may adversely affect the system. Defects artificially simulated on the test journal bearings are either worn defects, electrical defects, corrosion defects, fatigue defects, or peeling defects.

Therefore, the test journal bearings and housings coupled to the rotating shaft 10 are test journal bearings and housings in which any one of wear defects, electromotive defects, corrosion defects, fatigue defects, and peel defects are artificially simulated, and each defect The test journal bearing and the housing 6 can be interchanged with each other and can be coupled to the rotary shaft 10.

After the system journal bearing, the test journal bearing, and the rotating shaft 6 are coupled to the rotating shaft 10 and the hydraulic motor 1 is driven, when the rotating shaft 10 rotates, (System journal bearing and rotary shaft 5 and test journal bearing and rotary shaft 6) rotate.

In this way, during the rotation of the rotating bodies, the physical sensing signals generated in the rotating body itself or the surroundings may be continuously measured and collected. The collected signals correspond to signals representing various physical characteristics that may occur in the system when operating the rotating body including the defective journal bearings. The collected signal characteristics correspond to the signal characteristics used in the process of monitoring and diagnosing the journal bearing when the actual system is operated.

However, in actual operation of the system, serious problems occur when misalignment or mass unbalance occurs in a state where the journal bearing is defective. Therefore, the test apparatus for detecting a failure signal of a journal bearing according to the present invention includes a configuration capable of giving misalignment defects and mass unbalance defects corresponding to a system defective environment.

That is, a test apparatus for detecting a journal bearing defect signal according to the present invention is configured to provide a defect environment (misalignment, mass unbalance) that causes defects in a journal bearing. Here, the mass unbalance means that the center of gravity of the rotating body deviates from the center line of the rotation axis, and the misalignment means that the center between the journal bearing and the journal bearing does not coincide with each other.

Specifically, in the test apparatus for detecting a defect of a journal bearing defect according to the present invention, a disk 9 capable of providing a load due to mass unbalance defects is connected to the rotary shaft 10. That is, the disk 9 is coupled to the rotary shaft 10 in order to generate a mass unbalance defect in the rotary shaft during the rotation process, thereby providing a load to the test journal bearing.

The disk 9 is coupled to the rotating shaft 10 adjacent to the test journal bearing and housing 6. Specifically, as shown in FIGS. 1 and 2, the disk 9 is disposed between the system journal bearing and the housing 5, the test journal bearing and the housing 6, respectively, .

The disc 9, which is coupled between the system journal bearing and the housing 5 and the test journal bearing and housing 6 one by one, has the function of providing a load due to mass unbalance defects in the test journal bearing .

Therefore, the disk 9 may have a structure in which the center of gravity of the rotating body can be separated from the center line of the rotary shaft 10 during the rotational motion. For example, the disk 9 may not be formed in a complete disc shape, but may be a distorted disk or a polygonal structure of an irregular shape.

However, in the case of configuring the disk 9 in this form, there is a disadvantage in that the degree of mass unbalance can not be varied unless it is replaced with a new type disk. Therefore, in order to impart various mass unbalance states to the rotating body, it is troublesome to form various disks and replace them repeatedly.

Therefore, as shown in FIGS. 1 and 2, the disk 9 of the present invention is formed into a disk shape and is coupled to the rotating shaft 10, and a plurality of processing holes, which can mount the unbalanced mass body, Respectively.

2, the disk 9 has a disc shape, and has a plurality of mounting holes through which unbalanced masses can be inserted and mounted. As shown in FIG.

Thus, during rotation operation, the unbalanced mass can be coupled to a mounting hole formed in the disc 9 to provide a load due to various mass unbalances to the test journal bearing. Depending on the number and union position of the unbalanced masses coupled to the mounting holes formed in the disk 9, the load due to the mass imbalance applied to the test journal bearings during the rotation operation can be variously changed.

Thus, when the unbalanced mass is coupled to the disk and the rotating body is rotated, a load due to mass imbalance is applied to the test journal bearing. Accordingly, the various physical sensors disposed around the rotating body can measure physical quantity signals when a mass unbalance defect occurs.

The signal characteristics measured in such a mass unbalanced fault environment are collected, stored and analyzed by the signal acquisition / control device 20. The collected signal characteristics can be utilized in the process of monitoring and diagnosing the journal bearings and peripheral rotors during operation of the actual system.

In the above, the configuration for providing the mass unbalance load to the test journal bearings during the rotational motion has been described, and there are misalignments in other defect occurrence environments. The misalignment means a state in which the centers of the journal bearings do not coincide as described above.

In order to simulate the load applied to the test journal bearing due to the misalignment defect as described above, a load applying cylinder 14 is installed on the system journal bearing and the housing 5 in the present invention. In the present invention, the load applying cylinder 14 is exemplified to artificially impart misaligned defects. However, various methods and configurations can be adopted as long as the test journal bearing can be loaded with misalignment.

The load applying cylinder 14 is for simulating a load imposed by misalignment defects and is provided on the system journal bearing and the housing 5 to provide a force to push the housing downward.

1 and 3, the load applying cylinder 14 is installed on the system journal bearing and the housing 5, and provides a pushing force in a downward direction, Lt; RTI ID = 0.0 > fault. ≪ / RTI >

As described above, when the load applying cylinder 14 is driven and the system journal bearing and the housing 5 are pushed downward, a load due to misalignment defect can be given to the test journal bearing.

The load applied to the test journal bearing due to the misalignment defect can be varied by adjusting the pushing force of the load applying cylinder 14. [ Specifically, by controlling the hydraulic oil supply pressure of the oil pressure unit 41 by manually operating the load control device 40 in accordance with the magnitude of the force to be applied to the rotating system journal bearing and the housing 5, The load applied to the test journal bearing by the misalignment defect can be varied by varying the downward pushing force of the cylinder 14. [

Thus, when the load applying cylinder 14 pushes the system journal bearing and the housing 5 downward, a load due to a misalignment defect is applied to the test journal bearing. Therefore, the various physical sensors disposed around the rotating body can measure the physical quantity signals when misaligned defects occur.

The signal characteristics measured in such an erroneous defect environment are collected, stored and analyzed by the signal acquisition / control device 20. The collected signal characteristics can be utilized in the process of monitoring and diagnosing the journal bearings and peripheral rotors during operation of the actual system.

As described above, the test apparatus for detecting the journal bearing fault signal having the above-described configuration drives the hydraulic motor 1 to rotate the rotary shaft 10, and the rotary bodies are rotated at a specific rotation speed .

During rotation of the rotating body, various kinds of physical sensors disposed around the rotating body measure various physical signals and transmit them to the signal collecting / controlling device 20. Then, the signal collection / control device 20 stores and analyzes the collected signals.

As shown in FIG. 2, the physical sensors include a displacement sensor, a torque sensor, an acceleration sensor, and the like, and may further include a pressure sensor, a temperature sensor, and the like. These physical sensors are installed around the rotating body, and continuously measure the state change of the components constituting the testing device during the rotation of the rotating body, and transmit the measured state to the signal collecting / controlling device 20. This will be described later.

Specifically, at least one physical sensor is disposed at a predetermined position in the vicinity of the rotating body to measure physical signals related to the rotating body changed in accordance with the simulated defect of the test journal bearing. That is, at least one physical sensor (not shown) for measuring the change in state of the rotating shaft 10, the system journal bearing and housing 5, the test journal bearing, and the housing 6 according to the simulated defect of the test journal bearing, Is installed around the rotating body.

Hereinafter, additional structural features and functions of the components of the present invention will be described in further detail.

The structure of the system journal bearing and the housing 5 and the test journal bearing and the housing 6 according to the present invention has a structure reduced to 1/6 the size of the sleeve journal bearing for supporting the turbine shaft of a nuclear power plant.

The journal bearing and the housing have a structure in which the upper part and the lower part are separated from each other. Therefore, it is easy to join and separate the rotary shaft 10. The journal bearing has a structure that is fixed by a housing. The gap between the journal bearing and the rotary shaft is filled with lubricating oil in the Babbitt portion of the journal bearing.

The rotating bodies according to the present invention are installed on the rotating body pedestal 13 as shown in Fig. Specifically, it is formed on the table of the rotary body pedestal 13 to serve as a base support for fixing the pedestals supporting the rotary elements.

As shown in Fig. 1, each of the bearing supports for supporting the rotator elements includes a test journal bearing cradle 7, a system journal bearing cradle 8, and a torque sensor cradle 12, as shown in Fig.

The test journal bearing cradle 7 serves as a support for fixing the test journal bearing and the housing 6, as shown in Fig. The system journal bearing cradle 8 serves as a support for fixing the system journal bearing and the housing 5. In order to prevent the torque sensor 3, which is disposed between the first coupling 2 and the second coupling 4, from moving during the rotational movement, the torque sensor pedestal 12 is provided with a torque sensor 3) is fixedly supported.

Various sensors are disposed around a test apparatus for detecting a defect of a journal bearing defect according to the present invention. In other words, an encoder, a three-axis acceleration sensor, a displacement sensor, a bearing metal temperature sensor, a three-axis force sensor, a torque sensor, a lubricant inlet / outlet temperature sensor, and a lubricant supply pressure sensor are disposed around the rotor. This will be described later.

Hereinafter, a preferred embodiment of a test apparatus for detecting a journal bearing fault signal according to yet another embodiment to which the above-described test apparatus for detecting a journal bearing fault signal is added is described in detail.

FIG. 4 is a block diagram of a test apparatus for detecting a failure signal of a journal bearing according to an embodiment of the present invention, and FIG. 5 is an overall configuration diagram of a detection apparatus for a journal bearing coupling diagnosis according to an embodiment of the present invention.

4, the test apparatus for detecting a defect of a journal bearing defect according to the present invention includes a test section 100 formed by combining rotating bodies including a test journal bearing, A sensor unit 90 for measuring a signal corresponding to one physical quantity, a driving unit 110 for supplying a power source for driving the test unit 100, And a signal collecting and controlling unit 20 for controlling the driving unit 110 at the same time.

The test unit 100 constituting the test apparatus for detecting a defect of a journal bearing defect according to the present invention configured as described above is configured such that the rotating body including the test journal bearing is actually rotationally driven.

The test unit 100 is configured to couple the test journal bearings to the rotating shaft and to provide a defective environment, i.e., mass unbalance and misalignment. Specifically, the testing unit 100 includes a test journal bearing mounted on a rotating shaft to constitute a rotating body, and a load due to mass unbalance and misalignment is provided to the test journal bearing to perform an operation of rotating the rotating body . The specific details and operation details thereof have been described with reference to FIGS. 1 and 2. FIG.

During the rotation operation of the test section 100, signals relating to various physical quantities due to various defects of the test journal bearing should be measured. Accordingly, the test unit 100 is provided with a sensor unit 90 composed of various sensors. The sensor unit 90 measures signals related to various physical quantities so as to analyze how test journal bearings to which artifacts are artificially given are affected in a defective environment such as mass unbalance or misalignment.

Specifically, the sensor unit 90 measures a signal corresponding to at least one physical quantity, which is provided in the test unit 100 and appears for each defect type of the test journal bearing during the rotational motion of the rotating body. The types and operations of the sensors constituting the sensor unit 90 will be described later.

The test unit 100 is driven by the driving unit 110 so that the test unit 100 rotates normally and the sensor unit 90 can measure signals related to various physical quantities according to the defect types of the test journal bearings. Should be driven. That is, the driving unit 110 performs an operation of supplying power, lubricant, and hydraulic oil necessary for driving the test unit 100. [

4, the drive unit 110 includes a lubricant supply device 30, a hydraulic pressure supply device 50, and a load control device 40. [ A detailed description thereof will be given later.

The test apparatus for detecting a failure signal of a journal bearing according to the present invention preliminarily extracts signal characteristics for monitoring and diagnosing journal bearings in real time in the course of operating a system including actual journal bearings, Reliable signal characteristics should be detected and established to enable monitoring and diagnosis of journal bearings during operation.

Accordingly, in the present invention, the signal collection and control unit 20 collects and analyzes signals related to various physical quantities measured by the sensor unit 90. That is, the signal collection and control unit 20 collects the signals input from the sensor unit 90, and analyzes and stores the signals.

The signal collecting and controlling unit 20 extracts the signal characteristics related to various physical quantities according to the defect type of the test journal bearing using the collected signals and makes it possible to use it for monitoring and diagnosing journal bearings when operating the actual system . Meanwhile, the signal collecting and controlling unit 20 performs a function of controlling the driving unit 110 as well.

The test apparatus for detecting a defect of a journal bearing defect according to the present invention having such a configuration combines a test journal bearing artificially imparted with various defects to a test section 100 and rotationally drives the test journal bearing. And the signal is collected and analyzed by the signal collecting and controlling unit 20. The signal collecting and controlling unit 20 may be configured to measure signals corresponding to various physical quantities measured by the sensor unit 90 installed in the signal collecting and controlling unit 20.

The signal collecting and controlling unit 20 extracts signal characteristics related to various physical quantities appearing for each defect type of the test journal bearing using the collected signals. The signal characteristics of the test journal bearings thus extracted can be utilized with reliability in monitoring and diagnosing the journal bearings at the time of actual operation of the system. The test unit 100 is driven by the driving unit 110.

As described above, the test section 100 constituting the test apparatus for detecting the failure of the journal bearings is constituted by providing a test journal bearing on a rotating shaft to constitute a rotating body, and a load due to mass unbalance and misalignment Thereby rotating the rotating body.

The detailed components of the test unit 100 and their respective functions and operations have already been described with reference to FIGS. 1 and 2, and will not be described here.

As described above, the test apparatus for detecting the journal bearing fault signal having the above-described configuration drives the hydraulic motor 1 to rotate the rotary shaft 10, and the rotary bodies are rotated at a specific rotation speed .

During rotation of the rotating body, various kinds of physical sensors disposed around the rotating body measure various physical signals and transmit them to the signal collecting and controlling unit 20. Then, the signal collection and control unit 20 stores and analyzes the collected signals. Then, we use the collected signals to extract the signal characteristics related to each kind of physical quantity appearing by defect type of test journal bearing.

The physical sensors include a displacement sensor, a torque sensor, an acceleration sensor, and the like as described above, and may further include a pressure sensor, a temperature sensor, and the like. These physical sensors are installed around the rotating body and continuously measure the state change of the components constituting the testing apparatus during the rotation of the rotating body and transmit the measured state to the signal collecting and controlling unit 20.

Specifically, at least one physical sensor is disposed at a predetermined position in the vicinity of the rotating body to measure physical signals related to the rotating body changed in accordance with the simulated defect of the test journal bearing. That is, at least one physical sensor (not shown) for measuring the change in state of the rotating shaft 10, the system journal bearing and housing 5, the test journal bearing, and the housing 6 according to the simulated defect of the test journal bearing, Is installed around the rotating body. The specific configuration and functions of the sensor unit 90 composed of such physical sensors will be described later.

The test unit 100 configured as described above is driven by the drive unit 110 including the lubricant supply device 30, the hydraulic pressure supply device 50 and the load control device 40 as described above.

Specifically, the driving unit 110 includes a lubricant supply device 30 for supplying lubricant for lubricating the system journal bearings and the test journal bearings, a hydraulic pressure supply device (not shown) for supplying hydraulic oil for rotating the hydraulic motor 1 And a load control device 40 for controlling the hydraulic oil supply pressure of the hydraulic pressure unit 41 for supplying the hydraulic pressure to the load applying cylinder 14.

The lubrication supply device 30, the hydraulic pressure supply device 50 and the load control device 40 constituting the drive part 110 are connected to a power supply panel (denoted by 60 in FIG. 5) As shown in Fig.

The power supply panel 60 includes a lubrication cooler (denoted by reference numeral 70 in Fig. 5) for supplying power to the above-described signal collecting and controlling section 20 and for cooling the lubrication oil, The hydraulic oil cooler (denoted by 80 in Fig. 5) for cooling the hydraulic oil is also supplied with power.

The lubrication cooler 70 and the hydraulic oil cooler 80 cool the lubricating oil and the hydraulic oil respectively according to the set cooling temperatures and provide them to the lubricant supply device 30 and the hydraulic pressure supply device 50, respectively.

The lubricant supply device 30 supplies lubricant to the system journal bearings and the test journal bearings constituting the test portion 100, as shown in Fig. This lubricant is supplied to the gap between the journal bearing and the rotating shaft (10).

Specifically, the lubrication supply device 30 activates the pump according to the control signal of the signal collection and control section 20 to supply lubricant to the system journal bearings and the test journal bearings. The lubricating oil supplied to the system journal bearings and the test journal bearings is discharged to the lubricating cooler (70). The discharged lubricating oil passes through the lubricating cooler 70 and is recovered to the lubricating supply device 30 in a state where the heat is removed and the temperature is maintained.

The hydraulic pressure supply device 50 serves to supply hydraulic oil for starting the hydraulic motor 1 as described above. The hydraulic pressure supply device 50 is configured to control the hydraulic pressure in the case where the hydraulic motor 1 is in a stopped state, State, respectively.

8 is a diagram for explaining the operation of the hydraulic pressure supply device 50 when the hydraulic motor 1 is stopped.

As shown in FIG. 8, the signal collecting and controlling unit 20 transmits an OFF signal, which is a valve opening control signal, to the hydraulic control valve, thereby maintaining the hydraulic control valve in a CLOSE state. Then, the signal collection and control unit 20 sends a control signal to the hydraulic pressure supply device 50.

The hydraulic pressure supply device (50) starts the pump to supply the hydraulic oil. Then, the hydraulic oil bypassed from the hydraulic pressure control valve is passed through the hydraulic oil cooler 80. In this process, the hydraulic oil is recovered to the hydraulic pressure supply device 50 while the heat is removed and maintained at a predetermined temperature.

9 is a diagram for explaining the operation of the hydraulic pressure supply device 50 when the hydraulic motor 1 is in the starting state.

As shown in FIG. 9, the signal collecting and controlling unit 20 controls the opening degree of the hydraulic pressure control valve to supply hydraulic fluid to the hydraulic motor 1 so that the rotary shaft 10 can be rotated. At this time, some of the hydraulic oil is bypassed from the hydraulic control valve and passes through the hydraulic oil cooler 80. The hydraulic oil supplied to the hydraulic motor 1 is also collected and passed through the hydraulic oil cooler 80. Thus, the hydraulic fluid having passed through the hydraulic oil cooler 80 is recovered to the hydraulic pressure supply device 50 while the heat is removed and maintained at a predetermined temperature.

The test unit 100 operates according to the operation of the driving unit 110 as described above. During the rotation operation of the test unit 100, the sensor unit 90 is disposed in the test unit 100 as described above, and signals relating to various physical quantities appearing by defect types of the test journal bearings are measured.

FIG. 10 shows the types, installation positions, and measured physical quantities of various sensors constituting the sensor unit 90. FIG.

10, the sensor unit 90 includes an encoder, a three-axis acceleration sensor, a displacement sensor, a bearing metal temperature sensor, a three-axis force sensor, a torque sensor, a lubricant inlet / outlet temperature sensor, Sensor. The sensor unit 90 is composed of at least one sensor among the plurality of sensors.

The encoder measures a rotation shaft rotation speed signal for monitoring the rotation speed of the rotation shaft 10 and transmits the signal to the signal acquisition and control unit 20.

The three-axis acceleration sensor is installed in the vicinity of the journal bearing to measure a change in the vibration signal of the system journal bearing and the test journal bearing, and transmits the measurement signal to the signal acquisition and control unit 20. The signals measured by these three-axis acceleration sensors are used as a signal for monitoring damage to the journal bearing surface and vibration transmitted from an external device.

The signal collection and control unit 20 stores signals input from the three-axis acceleration sensor, and extracts and stores vibration signal characteristics exhibited by each type of defect of the test journal bearing using the signals.

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collection and control unit 20 can extract and store all the vibration signal characteristics exhibited by the defect types of the test journal bearings. As described above, the vibration signal characteristics exhibited by the defect types of the test journal bearings can be utilized with reliability assured when monitoring and diagnosing the journal bearings in real time during operation of the actual system.

The displacement sensor constituting the sensor unit 90 measures a distance signal to the surface of the rotation shaft and transmits the distance signal to the signal acquisition and control unit 20. That is, the displacement sensor measures the state of change in the distance between the surface of the rotating shaft and itself (displacement sensor), and transmits it to the signal collecting and controlling unit 20.

In order to measure the change of the distance between the surface of the rotating shaft and the sensor, the displacement sensor is provided at two positions at an angle of 90 degrees with respect to the center line of the rotating shaft to monitor the rotating motion of the rotating shaft, And is fixed near the rotation axis to extract the state signal characteristic.

Therefore, the signal collecting and controlling unit 20 extracts and stores the rotational motion trajectory signal characteristic of the rotational axis, which is indicated for each defect type of the test journal bearing, using the signal input from the displacement sensor.

The signal collecting and controlling unit 20 stores signals inputted from the displacement sensor and extracts and stores the rotational motion trajectory signal characteristic of the rotational axis represented by the defect type of the test journal bearing using the signals.

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collecting and controlling unit 20 can extract and store all of the rotational trajectory signal characteristics of the rotational axis, which are exhibited by the defect types of the test journal bearings. As described above, the characteristic of the rotation trajectory signal of the rotating shaft, which is exhibited by each defect type of the test journal bearing, can be utilized with reliability assured when monitoring and diagnosing journal bearings in real time during operation of the actual system.

Next, the bearing metal temperature measuring sensor measures the metal temperature of the bobbbit portion of the journal bearing inner surface, monitors the metal temperature rise due to the damage of the inner surface of the journal bearing, and extracts the bearing bobbin metal temperature signal characteristic exhibited by the type of journal bearing defect It is fixed near the journal bearing.

That is, the bearing metal temperature measuring sensor measures the inner surface metal temperature signals of the test journal bearings and transmits them to the signal collecting and controlling unit 20. Then, the signal collecting and controlling unit 20 extracts and stores the internal metal temperature signal characteristic of the journal bearing, which is classified according to the defect type of the test journal bearing, using the signals input from the bearing metal temperature measuring sensor.

The signal collecting and controlling unit 20 stores signals inputted from the bearing metal temperature measuring sensor and extracts the inner surface metal temperature signal characteristic of the journal bearing which is classified according to the defect type of the test journal bearing using the signals, do.

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collection and control unit 20 can extract and store all of the internal surface metal temperature signal characteristics of the journal bearings that appear for each defect type of the test journal bearings. As described above, the inner surface metal temperature signal characteristics of the journal bearings classified by the defect types of the test journal bearings can be utilized with reliability assured when monitoring and diagnosing the journal bearings in real time during operation of the actual system.

Next, the three-axis force sensor is fixed near the system journal bearing and the housing in order to measure the three-axis direction force applied to the journal bearing and the housing, and to extract the characteristic change of the force applied to the journal bearing and the rotational shaft.

That is, the three-axis force sensor measures the three-axis direction force applied to the bearing and the bearing housing, and transmits the three-axis force to the signal collection and control unit 20. Then, the signal acquisition and control unit 20 extracts the signal characteristics of the force applied to the bearing and the bearing housing by the rotary shaft using the signals input from the three-axis force sensor.

The signal collection and control unit 20 stores the signals input from the three-axis force sensor and extracts the signal characteristics of the force applied to the bearing and the housing by the rotation axis, which is indicated by the type of defect of the test journal bearing, .

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collecting and controlling unit 20 can extract and store all the signal characteristics of the force applied to the bearings and the housing by the rotational axis, which is indicated for each type of defect of the test journal bearing. Thus, the signal characteristics of the force applied to the bearing and the housing by the rotational axis, which is indicated by the defect type of the test journal bearing, can be utilized with reliability assured when monitoring and diagnosing the journal bearing in real time during operation of the actual system.

Next, the torque sensor measures the rotational torque acting on the rotational shaft and measures the rotational torque applied to the rotational shaft by the load of the component (journal bearings). The first and second couplings 2 and 4 As shown in FIG. That is, the torque sensor measures the rotation torque acting on the rotating shaft and transmits the measured torque to the signal collecting and controlling unit 20.

The signal collecting and controlling unit 20 stores signals inputted from the torque sensor and extracts a torque characteristic of the torque applied to the rotating shaft by the load of the component parts indicated by the defect type of the test journal bearing using the signals .

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collecting and controlling unit 20 can extract and store all the rotational torque signal characteristics of the rotational shaft due to the load of the component parts indicated by the defect type of the test journal bearing. As described above, the characteristics of the rotation torque signal applied to the rotating shaft due to the load of the component parts, which are classified according to the defect type of the test journal bearing, can be utilized with reliability in monitoring and diagnosing the journal bearing in real time during operation of the actual system .

Next, the lubricant inlet / outlet temperature sensor measures the temperature of the lubricant at the inlet and outlet of the journal bearing, monitors the temperature rise due to the heat generated by the damage of the journal bearing being transmitted to the lubricant, It is fixed near the journal bearing to extract the characteristics.

That is, the lubricant inlet / outlet temperature sensor measures the temperature of the lubricant oil entering the journal bearings and the temperature of the lubricant oil discharged from the journal bearings, and transmits the measured values to the signal collection and control unit 20. Then, the signal collecting and controlling unit 20 may extract and store the temperature signal characteristic of the lubricant oil represented by the defect type of the test journal bearing using the signals input from the lubricant inlet / outlet temperature measuring sensor.

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collecting and controlling unit 20 may extract and store all the temperature signal characteristics of the lubricant oil represented by the defect types of the test journal bearings. As described above, the temperature signal characteristic of the lubricant oil represented by the defect type of the test journal bearing can be utilized with reliability assured when monitoring and diagnosing journal bearings in real time during operation of the actual system.

Finally, the lubricant supply pressure measurement sensor is fixed near the journal bearing to measure the supply pressure of the lubricant supplied to each journal bearing and to monitor the supply amount of the lubricant supplied to the three journal bearings. That is, the lubricant supply pressure measuring sensor measures the supply pressure of the lubricant supplied to the system journal bearing and the test journal bearing, and transmits the measured pressure to the signal collecting and controlling unit 20.

Then, the signal collecting and controlling unit 20 can extract and store the signal characteristics related to the supply amount of the lubricating oil supplied to each journal bearing by using the signals input from the lubricating oil supply pressure sensor. As a result, the signal collecting and controlling section 20 can extract the signal characteristic relating to the supply amount of the lubricating oil supplied to each of the journal bearings, which is indicated by the defect type of the test journal bearing.

That is, the signal collecting and controlling unit 20 may be configured such that each test journal bearing having a wear defect, an electromechanical defect, a corrosion defect, a fatigue defect, and a peeling defect simulated on the test journal bearing is coupled to the rotation shaft 10 And extracts and stores signal characteristics corresponding to the type of the defect using input signals.

As a result, the signal collecting and controlling unit 20 may extract and store all the signal characteristics related to the supply amount of the lubricant oil supplied to the respective journal bearings, which are indicated by the defect types of the test journal bearings. As described above, the signal characteristics related to the supply amount of the lubricating oil supplied to each of the journal bearings, which are classified according to the defect types of the test journal bearings, can be utilized with reliability assured when monitoring and diagnosing journal bearings in real- have.

As described above, the signal collection and control unit 20 extracts the signal characteristics related to the physical quantities according to the defect types of the test journal bearings using the signals input from the respective sensors.

Therefore, it is a matter of course that the signal collection and control unit 20 includes various analysis modules. For example, the signal collection and control unit 20 includes a signal analysis processing unit as shown in FIG. The signal analysis processing unit is a software driven component.

As shown in FIG. 11, the signal analysis processing section includes a sensor and apparatus setting module, a test apparatus operation module, a real time signal processing module, and a vibration signal analysis module, which are processed in order. In FIG. 11, the signal analysis processing section includes a module for analyzing a vibration signal. However, it is needless to say that the module may include a module for analyzing signals corresponding to other physical quantities.

Each of the modules constituting the signal analysis processing unit will be briefly described as follows.

The sensor and device setting module is a setting module for device start-up and signal collection. It is used for setting the signal collection and noise removal filtering function between test runs, setting the signal storage method between test runs, setting the sensitivity for converting the measured voltage signal into physical quantity, Temperature, pressure, vibration, lubrication tank level alarm and trip setting.

The test device operation module is a module set in relation to the start-up of the apparatuses, and includes hydraulic oil and lubricant cooler start control function, lubricant supply device start control function, hydraulic pressure supply start control function, test device start control function , Test data storage time and file name setting function.

The real-time signal processing module is a module for displaying a real-time collected signal, and is implemented to enable simultaneous sampling of displacement, vibration, metal temperature, flow rate, and pressure signal using a trigger signal, And displays the results of the primary machining parameter calculation in real time with respect to the important supervisory signals.

The vibration signal analysis module is a module for analyzing detailed signal characteristics using stored data, and includes a statistical parameter analysis function (7 parameters) for a vibration signal, a power spectrum analysis function for analyzing a frequency characteristic of a vibration signal, (Orbit), analysis of spectrum and cascade characteristics of vibration and displacement signals, and analysis of spectral versus time (waterfall) characteristics of vibration and displacement signals.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

1: Hydraulic motor 2: First coupling
3: torque sensor 4: second coupling
5: System journal bearing and housing 6: Test journal bearing and housing
7: Test journal bearing base 8: System journal bearing base
9: Disk 10:
11: Axis movement fixed support base 12: Torque sensor base
13: rotatable pedestal 14: load applying cylinder
20: signal acquisition / control device 30: lubrication supply device
40: load control device 41: hydraulic unit
50: Hydraulic supply device 60: Power supply panel
70: Lubrication cooler 80: Hydraulic oil cooler
90: Sensor part 100: Test part
110:

Claims (5)

A rotating shaft that rotates by the rotational force of the hydraulic motor;
A system journal bearing and a housing coupled to a central portion of the rotating shaft, the system journal bearing comprising a stationary journal bearing and a housing for wrapping and fixing the same;
A test journal bearing and a housing disposed on both sides of the system journal bearing and the housing, the test journal bearing being coupled to the rotation shaft, the test journal bearing being defective and the housing being enclosed therein;
A disk disposed between the system journal bearing and the housing and the test journal bearing and the housing to be coupled to the rotational shaft and providing a load due to mass unbalance defects to the test journal bearing during a rotational operation;
And a load applying cylinder provided on the system journal bearing and the housing for providing a downward force to the test journal bearing to provide a load due to misalignment defects. Test equipment for.
The method according to claim 1,
Wherein the defect simulated in the test journal bearing is any one of a wear defect, an electrical defect, a corrosion defect, a fatigue defect, and a peeling defect.
The method according to claim 1,
A lubricant supply device for supplying lubricant for lubricating the system journal bearing and the test journal bearing, a hydraulic pressure supply device for supplying hydraulic oil for rotation of the hydraulic motor, and a hydraulic oil supply device for supplying the hydraulic oil to the load application cylinder And a load controller for controlling the pressure of the journalled bearing.
The method according to claim 1,
Further comprising a sensor unit for measuring a change in state of the rotating shaft, the system bearing journal and the housing, the test journal bearing, and the housing according to the simulated defects of the test journal bearing,
The sensor unit includes an encoder for measuring a rotation speed signal of the rotation shaft, a three-axis acceleration sensor for measuring a vibration signal of the system journal bearing and the test journal bearing, a displacement sensor for measuring a distance signal to the surface of the rotation shaft, A bearing metal temperature measurement sensor for measuring the internal surface metal temperature signal of the bearing, a three-axis force sensor for measuring a three-axis direction force signal applied to the system journal bearing and the housing, torque for measuring a rotation torque signal acting on the rotation axis A lubricant inlet and outlet temperature sensor for measuring a lubricant temperature signal at the inlet and outlet of the system journal bearing and the test journal bearing, and a lubricant supply pressure sensor for measuring a supply pressure signal of the lubricant supplied to the system journal bearing and the test journal bearing And at least one of Journal bearing defect signal detection test apparatus as ranging.
The method of claim 4,
And a signal collecting and controlling unit for collecting, analyzing and storing signals input from the sensor unit and controlling the driving unit,
Wherein the signal collection and control unit extracts a vibration signal characteristic represented by a defect type of the test journal bearing using a signal input from the 3-axis acceleration sensor, and detects a defect of the test journal bearing using a signal input from the displacement sensor, Extracting the characteristics of the internal metal temperature signal of the journal bearings according to the type of defect of the test journal bearing by using signals inputted from the bearing metal temperature measuring sensor, Wherein the temperature signal characteristic of the lubricant oil is extracted by using a signal input from the inlet and outlet temperature measuring sensor, and the characteristic of the temperature signal of the lubricant oil indicated by the defect type of the test journal bearing is extracted.

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